Pour batter into prepared pan. Bake in the preheated oven for 40 to 50 minutes, or until a toothpick inserted into the center of the cake comes out clean. Cool 10 minutes in the pan, then turn out onto a wire rack and cool completely.

To make the glaze: Melt the butter and 1 cup chocolate chips in a double boiler or microwave oven. Stir until smooth and drizzle over cake.